Carbureter.



C. L. RAYFIELD.

CARBURETER.

APPLICATION FILED JAN- 12. 1914.

1,234,29 Patented Mayl, 1917.

3 SHEETS-SHE I- C. L. RAYFIELD.

"CARBURETER. APPLICATION FILED JAN- 12. 1914.

Patented May 1, 1917.

3 SHEETS-SHEET 2.

C. L. RAYFIELD.

CARBURETER.

APPLICATION FILED JAN. 12. 1914.

Patented May 1, 1917.

3 SHEETS-SHEET 3- open position,

CHARLES I4. BAYFI'ELD, OF CHICAGO, ILLINOIS.

CARBURETER.

Specification of Letters Patent:

Patented May 1, 1917.

Application filed January 12, 1914. Serial no. 811,529.

To all whom it may concern.

Be it known that 1, CHARLES L. RAYFIELD, a citizen of the United States, and a resident of the city of Chicago, in the county of Cook and State of Illinois, have invented certain new and useful Improvements in Carbureters; and I do hereby declare that the following is a full, clear, and exact description of the same, reference being had to the accompanying drawings, and to the numerals of reference marked thereon, which form a part of this specification.

It has always been more or less difficult to induce proper carburetion when the throttle of a carbureter is suddenly moved into wide for the reason that it takes an appreciable time for the various elements forming the'mechanism of the carbureter, to

adjust themselves to the change in conditions whereby a sufficiently rich mixture may be introduced into the manifold of the engine. Generally with the sudden opening of the carbureter throttle the proportion of air in the mixture is greatly increased, untilthe fuel valve opens sufficiently to admit a greater amount of hydro-carbon.

This invention relates to a carbureter having auxiliary means connected therewith and adapted to be actuated by the throttle mechanism, for introducing a charge of fuel under pressure into the mixing chamber of the carbureter simultaneously with a sudden.

opening of the throttle valve, thus insuring the immediate introduction of arich mixture to the engine.

Oftentimes the inability of an engine to pick up or accelerate upon a sudden opening of the throttle, except very slowly, has been attributed to the engine itself, whereas it is no doubt traceable to the carbureter, which is incapable of responding immediately to the extreme conditions imposed thereon. In my invention, however, a small piston pump acts to introduce a charge of hydro-carbon directly into the mixing chamber of a carbureter independently of all other fuel supply means, and furthermore acts to introduce the fuel under pressure to insure a thorough spraying thereof into the mixing chamber and in the direction of How of a mixture therethrough.

It is an object of this invention to construct a carbureter having mechanism associated therewith whereby a sudden opening of a throttle valve will cause a simultaneous introduction of hydro-carbon into the mixof the throttle valve.

ing chamber of the carbureter under pressure, control mechanisms.

It is also an object of this invention to construct a carbureter having asmall fuel cyllnder mounted thereon provided with a plston connected to the throttle valve of the carbureter, whereby a supply of fuel in said cylinder which is connected with the float feed chamber of the device, may be introduced directly to the mixing chamber of the carbureter simultaneously w1th an opening It is also an object of this invention to construct a carbureter having a spring pressed piston movable in a fuelcylinder and so connected for operation that a small variation in the movement of the throttle valve will exert practically no effect upon the piston to force hydro-carbon from the cylinder, but wherein asudden movement of the throttle will cause said piston to force a charge of fuel to the mixing chamber of the carbureter.

It is also an object of this invention to construct a carbureter having an auxiliary mechanism associated therewith for introducing a charge of fuel into the mixing chamber with a sudden opening of the throttle valve, and at the same time prevent a reverse flow of fuel through said auxiliary mechanism, said auxiliary mechanism acting with a slow opening of the throttle to close the connecting passages to prevent a flow 0 fuel through said mechanism to the mixing chamber, induced by the draft of the engine.

It is also an object of this invention to construct a carbureter having an auxiliary fuel cylinder connected thereon and actuatable by the throttle of the carbureter, whereby a piston within said cylinder acts in its movement to close the inlet to said cylinder and to force the sure.

It is also an object of this invention-to construct a fuel cylinder having a' piston movable therein for forcing fuel into the mixing chamber of the carbureter under pressure, and with an abrupt cam mounted on the throttle valve shaft of the carbureter acting to move said piston suddenly in said cylinder when the throttle valve is actuated for the purpose.

It is furthermore an object of this invention to construct cam actuated auxiliary fuel supply means adapted to introduce acharge fuel therefrom under presand independently of all other fuel of fuel under pressure into the mixing chamber of a carbureter when the throttle valve is suddenly actuated into open pos tion.

It is finally an object of this inventlon to construct a simple device acting to introduce fuel into the carbureter mixing chamber only when the throttle valve is suddenly actuated.

The invention (in a preferred form) 1s hereinafter more fully describedand defined in the accompanying drawings and specification.

In the drawings:

Figure 1 is a front elevation of one side of a carbureter.

Fig. 2 isa similar view of the other side thereof, with parts broken away.

Fig. 3 is a top plan view of the same.

Fig. 4 is a section taken on l1ne 44 of Fig. 3, with parts in elevation.

Fig. 5 is a section taken on line 55 of Fig. 3.

Fig. 6 is a fragmentary 880131011911 line 6-6- of Fig. 3, with parts in elevatlon.

As shown in the drawings:

The carbureter comprises a float feed chamber 1, having a cover 2, and a float 3, therein. An inlet pipe 4, admits fuel to the float feed chamber through an apertured valve seat member 5, which is opened and closed by a tubular spring pressed needle valve 6. Movement of the float 3, 1s transmitted to said needle valve 6, at proper intervalsto open the same by means of a pivoted rocker arm 7, which engages .at one of its ends beneath a flange 8, on said needle valve element 6, and at its other end is adapted to receive a stem 9, therethrough,

on which said float 3, is secured. An apertured threaded outlet element 10, is mounted in said float feed chamber and projects downwardly within the tubular needle valve element 6, to afford a guide therefor. A spring pressed vertically movable needle valve 11, is adapted to open and close the aperture in said member 10, to permit a flow of hydro-carbon therethrough and into a mixing chamber 12, through a passage 13, which communicates directly with the float feed chamber through said element 10.

The outlet from the mixing chamber is controlled by a pivoted throttle valve 14, securedon a shaft 15, and is connected with a smaller similar valve 16, by means of a connecting arm 17, insuring simultaneous action of the two valves, the valve16, of course, serving as a means for controlling the admission of air to the mixing chamber of the carbureter. Another air inlet to the mixing chamber is provided through a passage 18, which is normally closed by an adjustable spring thrust puppet valve 19.

' An actuating lever 20, is secured on said shaft 15, on one side of the carbureter for operating the respective valves 14,-and 16.

menace casing 27, which is supported and keyed.

upon said transverse shaft 24, by means of a horizontal projecting lug 28.

At its other end said horizontal shaft 24, is provided with an arm 29, which engages in a notch in said spring thrust needle valve element 11. Thus when the throttle valve is opened or closed the cam element 21, connected on the shaft 15, causes a certain movement of said bell crank, which in turn causes a movement of the shaft 26, and with a consequent movement of said transverse shaft 24, and with such movement of said shaft 24, a corresponding movement is of course transmitted to the needle valve element 11.

The purpose of the cam element 25, bearing against the adjustable set screw 23, is to provide a means of opening the needle valve without opening the throttle valve, and for this purpose a cord or cable is attached to any'suitable projection 25*, on said shaft 26, at the upper end thereof to rotate the same, thus causin thecam 25, at the lower end of said shaft to cause the casing 27, to move about its pivotal support or on said shaft 24, to which it is keyed, thus causing an opening of the needle valve by said shaft 24. This is sometimes desirable for admitting fuel to the carbureter prior to starting of the motor to insure a rich mixture and an overabundance of fuel.

Mounted on the outer side of the mixing chamber opposite from said lever 20, is a cylinder 30, which may be cast integral with the casing or attached thereto in any suitable manner as desired. An inlet to said cylinder 30, is provided by a pipe 31, communicating therewith and with the float feed chamber of the carbureter, and an outlet pipe 32, communicates with the lower end of the cylinder and the mixing chamber of the carbureter. A piston 33, is slidably mounted in said cylinder 30, and is normally held at the upper end thereof by means of a spiral spring 34, seated in the bottom of and bears on a flattened extension 36, of said piston 33. Thus it may be seen that when the throttle valve is suddenly opened rotation of said cam 35, will cause a consequent downward movement of the piston 33, thus shutting off the inlet to the cylinder and forcing the contained fuel in the cylinder out through the outlet pipe 32, and into the mixing chamber of the carbureter.

The operation is as follows:

The particular arrangement of throttle and inlet air valves to the mixing chamber, and the connection between the fuel valve and said valves for simultaneous operation therewith is fully described and claimed in other of my co-pending applications for patent, and hence is not entered in more in detail here. However, it is obvious that the chamber 30, is normally filled with fuel, owing to the higher level of the same within the float feed chamber of the carbureter, so that with a sudden opening of the throttle valve the piston 33, in'the cylinder will be impelled downwardly, thus shutting off the supply of fuel to the cylinder and forcing the contained fuel upwardly into the mixing chamber through the pipe 32, leading from the cylinder 30, to the mixing chamber of the carbureter.

Owing to the fact that the pipe 32, communicates with the mixing chamber at a point substantially above the fuel level 'in the float feed chamber and also in the cylinder 30, small variations in movement of the throttle valve causing a small movement of the piston 33, in various amounts will not force the fuel into the mixing chamber but will merely cause a rising and falling of the level of the fuel, in the pipe 32. However, as before stated with a sudden opening of the throttle the piston 33, will be impelled downwardly and with such force asto cause an injection of fuel into the mixing chamber under considerable pressure, thus insuring a thoroughly rich mixture passing to the engine and'efi'ectively causing the engine to pick up or accelerate.

I am aware that various details of construction may be varied through a wide range without departing from the principles of this invention. I therefore do not purpose limiting the patent granted otherwise than necessitated by the prior art.

I claim as my invention:

1. In a carbureter of the class described a mixing chamber, a float feed chamber,means admitting fuel into said mixing chamber from said float feed chamber, a throttle valve in said mixing chamber, a throttle valve Yshaft therefor, cams secured thereon, and

auxiliary means communicating with said float feed chamber and with said mixing chamber, said cams adapted to simultaneously actuate said fuel admitting means and said auxiliary means to inject independent charges of fuel into the mixing chamber with a sudden opening of the throttle valve.

2. In a carbureter of the class described the combination with a float chamber and mixing chamber thereof, of a throttle valve controlling the flow from the mixing chamber, a shaft on which said throttle valve is mounted, an integral auxiliary fuel cylinder formed on the exterior of the mixing chamber, a pipe for conveying fuel thereto communicating near the upper end thereof and with the float chamber, an outlet pipe communicating-with the lower end of said cylinder and leading into said mixing chamber, a piston movable in said cylinder, a spring coiled Within said cylinder to resist inward movement of the vpiston therein, a shaft on said throttle valve shaft for actuating said piston directly, said piston acting to control the inlet of fuel to said cylinder in its downward movement and to force the fuel from said cylinder through said outlet pipe into the mixing chamber as the throttle valve is opened.

3. In a device of the class described a cylinder mounted on a carbureter, a piston slidable therein, a cam rigidly secured to the throttle valve shaft of the carbureter contacting said piston to actuate the same, a fuel inlet in said 0 linder, an outlet in the lower end of sai cylinder, said piston adapted to close said inlet in its downward movement and eject a charge of fuel under pressure from said cylinder through said outlet into the carbureter. 4. In a priming device attachment for a carbureter the combination with a carbureter casing of a cylinder integrally formed on the exterior thereof, an inlet through said cylinder in the upper end thereof, a pipe communicating between said inlet and the float chamber of the carbureter, an outlet pipe communicating at the lower end of said cylinder communicating into the mixing chamber of the carbureter at a point be,

, on the end of said shaft directly contacting the upper surface of the upper end ofthe piston to actuate the same.

5.. In a device of the' class described, a carbureter comprising a float feed chamber, a mixing chamber, a throttle valve therein,

a shaft on which said throttle valve is mounted, a plurality of camson said shaft, a needle valve actuated from one of said cams permitting a flow of fuel from said float feed chamber to said mixing chamber, and means actuatable by the other of said cams for introducing a charge of fuel under pressure by said means from the float feed chamber to the mixing chamber of the car- .bureter independently of said fuel needle the mixing chamber of the carbureter, a.

spring mounted in said cylinder, a piston mounted in said cylinder movable against the'compression of said spring and operating by downward movement toclose the in let to said cylinder to force a charge of fuel through the outlet thereof into the mixing chamber, a cam on the throttle valve shaft for actuating said piston directly, a needle fuel valve for admitting fuel into the mixing chamber of the carbureter from the float feed chamber, and another cam mounted on said throttle valve shaft for operating said needle fuel valve whereby with an opening movement of the throttle valve said needle fuel valve is opened, and the piston depressed in the cylinder to force the charge of fuelinto the mixing chamber together with but independent of the fuel admitted by said needle fuel valve.

7. In a carbureter of the'class described fuel supply means therefor, a mixing chamber, a needle valve, a throttle 'valve, auxiliary fuel supply means for introducing a charge of fuel into .the mixing chamber independently of said needle valve, and connections' between said needle valve, said throttle valve and said auxiliary means to insure an opening of the needle valve and an introduction of a charge of fuel to said mixin chamber with the opening of the throttle va ve, said needle valve and said auxiliary fuel supply means.

In testimony whereof I have hereunto subscribed my name in the presence of two subscribing witnesses.

' CHARLES L. RAYFIELD.

Witnesses:

CHARLES W. HILLS, J r., FRANK K. Henson. 

